474 lines
12 KiB
C
474 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2018-2021 Linaro Ltd.
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/interconnect.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/bitops.h>
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#include "ipa.h"
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#include "ipa_power.h"
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#include "ipa_endpoint.h"
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#include "ipa_modem.h"
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#include "ipa_data.h"
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/**
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* DOC: IPA Power Management
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*
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* The IPA hardware is enabled when the IPA core clock and all the
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* interconnects (buses) it depends on are enabled. Runtime power
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* management is used to determine whether the core clock and
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* interconnects are enabled, and if not in use to be suspended
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* automatically.
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*
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* The core clock currently runs at a fixed clock rate when enabled,
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* an all interconnects use a fixed average and peak bandwidth.
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*/
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#define IPA_AUTOSUSPEND_DELAY 500 /* milliseconds */
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/**
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* struct ipa_interconnect - IPA interconnect information
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* @path: Interconnect path
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* @average_bandwidth: Average interconnect bandwidth (KB/second)
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* @peak_bandwidth: Peak interconnect bandwidth (KB/second)
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*/
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struct ipa_interconnect {
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struct icc_path *path;
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u32 average_bandwidth;
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u32 peak_bandwidth;
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};
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/**
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* enum ipa_power_flag - IPA power flags
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* @IPA_POWER_FLAG_RESUMED: Whether resume from suspend has been signaled
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* @IPA_POWER_FLAG_SYSTEM: Hardware is system (not runtime) suspended
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* @IPA_POWER_FLAG_STOPPED: Modem TX is disabled by ipa_start_xmit()
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* @IPA_POWER_FLAG_STARTED: Modem TX was enabled by ipa_runtime_resume()
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* @IPA_POWER_FLAG_COUNT: Number of defined power flags
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*/
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enum ipa_power_flag {
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IPA_POWER_FLAG_RESUMED,
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IPA_POWER_FLAG_SYSTEM,
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IPA_POWER_FLAG_STOPPED,
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IPA_POWER_FLAG_STARTED,
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IPA_POWER_FLAG_COUNT, /* Last; not a flag */
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};
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/**
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* struct ipa_power - IPA power management information
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* @dev: IPA device pointer
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* @core: IPA core clock
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* @spinlock: Protects modem TX queue enable/disable
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* @flags: Boolean state flags
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* @interconnect_count: Number of elements in interconnect[]
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* @interconnect: Interconnect array
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*/
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struct ipa_power {
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struct device *dev;
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struct clk *core;
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spinlock_t spinlock; /* used with STOPPED/STARTED power flags */
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DECLARE_BITMAP(flags, IPA_POWER_FLAG_COUNT);
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u32 interconnect_count;
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struct ipa_interconnect *interconnect;
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};
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static int ipa_interconnect_init_one(struct device *dev,
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struct ipa_interconnect *interconnect,
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const struct ipa_interconnect_data *data)
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{
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struct icc_path *path;
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path = of_icc_get(dev, data->name);
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if (IS_ERR(path)) {
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int ret = PTR_ERR(path);
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dev_err_probe(dev, ret, "error getting %s interconnect\n",
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data->name);
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return ret;
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}
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interconnect->path = path;
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interconnect->average_bandwidth = data->average_bandwidth;
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interconnect->peak_bandwidth = data->peak_bandwidth;
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return 0;
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}
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static void ipa_interconnect_exit_one(struct ipa_interconnect *interconnect)
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{
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icc_put(interconnect->path);
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memset(interconnect, 0, sizeof(*interconnect));
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}
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/* Initialize interconnects required for IPA operation */
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static int ipa_interconnect_init(struct ipa_power *power, struct device *dev,
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const struct ipa_interconnect_data *data)
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{
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struct ipa_interconnect *interconnect;
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u32 count;
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int ret;
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count = power->interconnect_count;
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interconnect = kcalloc(count, sizeof(*interconnect), GFP_KERNEL);
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if (!interconnect)
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return -ENOMEM;
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power->interconnect = interconnect;
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while (count--) {
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ret = ipa_interconnect_init_one(dev, interconnect, data++);
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if (ret)
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goto out_unwind;
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interconnect++;
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}
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return 0;
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out_unwind:
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while (interconnect-- > power->interconnect)
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ipa_interconnect_exit_one(interconnect);
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kfree(power->interconnect);
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power->interconnect = NULL;
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return ret;
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}
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/* Inverse of ipa_interconnect_init() */
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static void ipa_interconnect_exit(struct ipa_power *power)
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{
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struct ipa_interconnect *interconnect;
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interconnect = power->interconnect + power->interconnect_count;
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while (interconnect-- > power->interconnect)
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ipa_interconnect_exit_one(interconnect);
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kfree(power->interconnect);
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power->interconnect = NULL;
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}
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/* Currently we only use one bandwidth level, so just "enable" interconnects */
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static int ipa_interconnect_enable(struct ipa *ipa)
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{
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struct ipa_interconnect *interconnect;
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struct ipa_power *power = ipa->power;
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int ret;
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u32 i;
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interconnect = power->interconnect;
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for (i = 0; i < power->interconnect_count; i++) {
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ret = icc_set_bw(interconnect->path,
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interconnect->average_bandwidth,
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interconnect->peak_bandwidth);
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if (ret) {
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dev_err(&ipa->pdev->dev,
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"error %d enabling %s interconnect\n",
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ret, icc_get_name(interconnect->path));
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goto out_unwind;
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}
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interconnect++;
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}
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return 0;
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out_unwind:
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while (interconnect-- > power->interconnect)
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(void)icc_set_bw(interconnect->path, 0, 0);
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return ret;
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}
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/* To disable an interconnect, we just its bandwidth to 0 */
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static int ipa_interconnect_disable(struct ipa *ipa)
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{
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struct ipa_interconnect *interconnect;
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struct ipa_power *power = ipa->power;
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struct device *dev = &ipa->pdev->dev;
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int result = 0;
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u32 count;
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int ret;
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count = power->interconnect_count;
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interconnect = power->interconnect + count;
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while (count--) {
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interconnect--;
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ret = icc_set_bw(interconnect->path, 0, 0);
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if (ret) {
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dev_err(dev, "error %d disabling %s interconnect\n",
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ret, icc_get_name(interconnect->path));
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/* Try to disable all; record only the first error */
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if (!result)
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result = ret;
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}
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}
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return result;
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}
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/* Enable IPA power, enabling interconnects and the core clock */
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static int ipa_power_enable(struct ipa *ipa)
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{
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int ret;
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ret = ipa_interconnect_enable(ipa);
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if (ret)
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return ret;
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ret = clk_prepare_enable(ipa->power->core);
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if (ret) {
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dev_err(&ipa->pdev->dev, "error %d enabling core clock\n", ret);
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(void)ipa_interconnect_disable(ipa);
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}
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return ret;
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}
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/* Inverse of ipa_power_enable() */
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static int ipa_power_disable(struct ipa *ipa)
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{
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clk_disable_unprepare(ipa->power->core);
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return ipa_interconnect_disable(ipa);
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}
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static int ipa_runtime_suspend(struct device *dev)
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{
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struct ipa *ipa = dev_get_drvdata(dev);
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/* Endpoints aren't usable until setup is complete */
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if (ipa->setup_complete) {
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__clear_bit(IPA_POWER_FLAG_RESUMED, ipa->power->flags);
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ipa_endpoint_suspend(ipa);
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gsi_suspend(&ipa->gsi);
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}
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return ipa_power_disable(ipa);
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}
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static int ipa_runtime_resume(struct device *dev)
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{
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struct ipa *ipa = dev_get_drvdata(dev);
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int ret;
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ret = ipa_power_enable(ipa);
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if (WARN_ON(ret < 0))
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return ret;
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/* Endpoints aren't usable until setup is complete */
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if (ipa->setup_complete) {
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gsi_resume(&ipa->gsi);
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ipa_endpoint_resume(ipa);
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}
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return 0;
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}
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static int ipa_suspend(struct device *dev)
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{
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struct ipa *ipa = dev_get_drvdata(dev);
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__set_bit(IPA_POWER_FLAG_SYSTEM, ipa->power->flags);
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return pm_runtime_force_suspend(dev);
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}
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static int ipa_resume(struct device *dev)
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{
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struct ipa *ipa = dev_get_drvdata(dev);
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int ret;
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ret = pm_runtime_force_resume(dev);
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__clear_bit(IPA_POWER_FLAG_SYSTEM, ipa->power->flags);
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return ret;
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}
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/* Return the current IPA core clock rate */
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u32 ipa_core_clock_rate(struct ipa *ipa)
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{
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return ipa->power ? (u32)clk_get_rate(ipa->power->core) : 0;
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}
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/**
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* ipa_suspend_handler() - Handle the suspend IPA interrupt
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* @ipa: IPA pointer
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* @irq_id: IPA interrupt type (unused)
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*
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* If an RX endpoint is suspended, and the IPA has a packet destined for
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* that endpoint, the IPA generates a SUSPEND interrupt to inform the AP
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* that it should resume the endpoint. If we get one of these interrupts
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* we just wake up the system.
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*/
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static void ipa_suspend_handler(struct ipa *ipa, enum ipa_irq_id irq_id)
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{
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/* To handle an IPA interrupt we will have resumed the hardware
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* just to handle the interrupt, so we're done. If we are in a
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* system suspend, trigger a system resume.
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*/
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if (!__test_and_set_bit(IPA_POWER_FLAG_RESUMED, ipa->power->flags))
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if (test_bit(IPA_POWER_FLAG_SYSTEM, ipa->power->flags))
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pm_wakeup_dev_event(&ipa->pdev->dev, 0, true);
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/* Acknowledge/clear the suspend interrupt on all endpoints */
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ipa_interrupt_suspend_clear_all(ipa->interrupt);
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}
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/* The next few functions coordinate stopping and starting the modem
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* network device transmit queue.
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*
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* Transmit can be running concurrent with power resume, and there's a
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* chance the resume completes before the transmit path stops the queue,
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* leaving the queue in a stopped state. The next two functions are used
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* to avoid this: ipa_power_modem_queue_stop() is used by ipa_start_xmit()
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* to conditionally stop the TX queue; and ipa_power_modem_queue_start()
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* is used by ipa_runtime_resume() to conditionally restart it.
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*
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* Two flags and a spinlock are used. If the queue is stopped, the STOPPED
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* power flag is set. And if the queue is started, the STARTED flag is set.
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* The queue is only started on resume if the STOPPED flag is set. And the
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* queue is only started in ipa_start_xmit() if the STARTED flag is *not*
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* set. As a result, the queue remains operational if the two activites
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* happen concurrently regardless of the order they complete. The spinlock
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* ensures the flag and TX queue operations are done atomically.
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*
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* The first function stops the modem netdev transmit queue, but only if
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* the STARTED flag is *not* set. That flag is cleared if it was set.
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* If the queue is stopped, the STOPPED flag is set. This is called only
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* from the power ->runtime_resume operation.
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*/
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void ipa_power_modem_queue_stop(struct ipa *ipa)
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{
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struct ipa_power *power = ipa->power;
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unsigned long flags;
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spin_lock_irqsave(&power->spinlock, flags);
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if (!__test_and_clear_bit(IPA_POWER_FLAG_STARTED, power->flags)) {
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netif_stop_queue(ipa->modem_netdev);
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__set_bit(IPA_POWER_FLAG_STOPPED, power->flags);
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}
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spin_unlock_irqrestore(&power->spinlock, flags);
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}
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/* This function starts the modem netdev transmit queue, but only if the
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* STOPPED flag is set. That flag is cleared if it was set. If the queue
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* was restarted, the STARTED flag is set; this allows ipa_start_xmit()
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* to skip stopping the queue in the event of a race.
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*/
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void ipa_power_modem_queue_wake(struct ipa *ipa)
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{
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struct ipa_power *power = ipa->power;
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unsigned long flags;
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spin_lock_irqsave(&power->spinlock, flags);
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if (__test_and_clear_bit(IPA_POWER_FLAG_STOPPED, power->flags)) {
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__set_bit(IPA_POWER_FLAG_STARTED, power->flags);
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netif_wake_queue(ipa->modem_netdev);
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}
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spin_unlock_irqrestore(&power->spinlock, flags);
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}
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/* This function clears the STARTED flag once the TX queue is operating */
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void ipa_power_modem_queue_active(struct ipa *ipa)
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{
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clear_bit(IPA_POWER_FLAG_STARTED, ipa->power->flags);
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}
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int ipa_power_setup(struct ipa *ipa)
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{
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int ret;
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ipa_interrupt_add(ipa->interrupt, IPA_IRQ_TX_SUSPEND,
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ipa_suspend_handler);
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ret = device_init_wakeup(&ipa->pdev->dev, true);
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if (ret)
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ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND);
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return ret;
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}
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void ipa_power_teardown(struct ipa *ipa)
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{
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(void)device_init_wakeup(&ipa->pdev->dev, false);
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ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND);
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}
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/* Initialize IPA power management */
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struct ipa_power *
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ipa_power_init(struct device *dev, const struct ipa_power_data *data)
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{
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struct ipa_power *power;
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struct clk *clk;
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int ret;
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clk = clk_get(dev, "core");
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if (IS_ERR(clk)) {
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dev_err_probe(dev, PTR_ERR(clk), "error getting core clock\n");
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return ERR_CAST(clk);
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}
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ret = clk_set_rate(clk, data->core_clock_rate);
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if (ret) {
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dev_err(dev, "error %d setting core clock rate to %u\n",
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ret, data->core_clock_rate);
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goto err_clk_put;
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}
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power = kzalloc(sizeof(*power), GFP_KERNEL);
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if (!power) {
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ret = -ENOMEM;
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goto err_clk_put;
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}
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power->dev = dev;
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power->core = clk;
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spin_lock_init(&power->spinlock);
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power->interconnect_count = data->interconnect_count;
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|
|
||
|
ret = ipa_interconnect_init(power, dev, data->interconnect_data);
|
||
|
if (ret)
|
||
|
goto err_kfree;
|
||
|
|
||
|
pm_runtime_set_autosuspend_delay(dev, IPA_AUTOSUSPEND_DELAY);
|
||
|
pm_runtime_use_autosuspend(dev);
|
||
|
pm_runtime_enable(dev);
|
||
|
|
||
|
return power;
|
||
|
|
||
|
err_kfree:
|
||
|
kfree(power);
|
||
|
err_clk_put:
|
||
|
clk_put(clk);
|
||
|
|
||
|
return ERR_PTR(ret);
|
||
|
}
|
||
|
|
||
|
/* Inverse of ipa_power_init() */
|
||
|
void ipa_power_exit(struct ipa_power *power)
|
||
|
{
|
||
|
struct device *dev = power->dev;
|
||
|
struct clk *clk = power->core;
|
||
|
|
||
|
pm_runtime_disable(dev);
|
||
|
pm_runtime_dont_use_autosuspend(dev);
|
||
|
ipa_interconnect_exit(power);
|
||
|
kfree(power);
|
||
|
clk_put(clk);
|
||
|
}
|
||
|
|
||
|
const struct dev_pm_ops ipa_pm_ops = {
|
||
|
.suspend = ipa_suspend,
|
||
|
.resume = ipa_resume,
|
||
|
.runtime_suspend = ipa_runtime_suspend,
|
||
|
.runtime_resume = ipa_runtime_resume,
|
||
|
};
|